The Crinoids

question 84

Multiple Choice

The crinoids

• A)have the most primitive characters.
• B)have far fewer living species than are found in the fossil record.
• C)include the shallow-water feather stars of tropical oceans.
• D)include sea lilies that resemble a stalked flower.
• E)all of the choices are correct.

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Definitions:

Collision Theory

A theory that proposes chemical reactions occur when reactant molecules collide with sufficient energy and an appropriate orientation.

High Energy

A term used to describe processes, particles, or quantum states having relatively large amounts of kinetic or potential energy.

Particle Motion

The description of the kinetic activity of particles in matter, affected by temperature and physical state, underlying the principles of diffusion and gas behavior.

Reaction Speed

The rate at which reactants are converted to products in a chemical reaction.